AD7994BRU-0

Overview

The AD7994BRU-0 is a 12-bit, 4-channel successive approximation analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It features an I2C-compatible serial interface and operates on a single supply voltage ranging from 2.7 V to 5.5 V. The device provides a throughput rate of up to 188 kSPS with a typical conversion time of 2 µs. Key electrical specifications include a signal-to-noise ratio (SNR) of 71 dB, integral nonlinearity (INL) of ±1 LSB, and differential nonlinearity (DNL) of +1/–0.9 LSB. It utilizes a 16-lead TSSOP package and supports an operating temperature range from -40°C to +125°C.

Feature Summary

• Four single-ended analog input channels with integrated multiplexer and track-and-hold amplifier
• I2C-compatible serial interface supporting standard, fast, and high-speed modes with pin-selectable addressing
• Configurable out-of-range indicator/alert function for monitoring conversion results against programmed limits
• Low power consumption with automatic shutdown mode reducing current draw to 1 µA maximum when inactive

Applications

• Portable battery-powered instrumentation systems requiring low power consumption
• Industrial process control applications involving multi-channel data acquisition
• Automotive sensor interfaces operating within extended temperature ranges
• Medical equipment utilizing single-supply operation and compact packaging

Procurement Notes

Verify the specific suffix '0' indicates support for standard and fast I2C modes only, distinct from the '-1' variant which supports high-speed mode. Confirm the 'B' grade designation corresponds to the industrial temperature range of -40°C to +125°C. Ensure the TSSOP-16 package dimensions match the target PCB footprint requirements before finalizing procurement orders.

Selection Notes

Select this component when four single-ended inputs are required alongside I2C connectivity. The 12-bit resolution and 188 kSPS throughput suit moderate-speed applications. Consider the external reference requirement, as the REFIN pin must be driven between 1.2 V and VDD. Evaluate the ALERT pin utility if hardware-based limit monitoring is preferred over software polling.

Part Context

The AD7994 belongs to the AD7993/AD7994 family of low-power ADCs. It serves as the 12-bit counterpart to the 10-bit AD7993. Both share identical pinouts and operational modes. Related devices in the product line include the 8-channel AD7998 and the 2-channel AD7992, offering scalability for different channel count requirements while maintaining interface compatibility.

Replacement Considerations

The AD7993BRU-0 offers identical pinout and functionality with 10-bit resolution. The AD7994BRU-1Z provides the same 12-bit performance but supports high-speed I2C modes. Verify register compatibility and I2C address configurations when substituting these variants.